<pre>  /**
   * The constants used in this Content Widget.
   */
  public static interface CwConstants extends Constants {
    String cwFlexTableAddRow();

    String cwFlexTableDescription();

    String cwFlexTableDetails();

    String cwFlexTableName();

    String cwFlexTableRemoveRow();
  }

  /**
   * An instance of the constants.
   */
  private final CwConstants constants;

  /**
   * Initialize this example.
   */
  @Override
  public Widget onInitialize() {
    // Create a Flex Table
    final FlexTable flexTable = new FlexTable();
    FlexCellFormatter cellFormatter = flexTable.getFlexCellFormatter();
    flexTable.addStyleName("cw-FlexTable");
    flexTable.setWidth("32em");
    flexTable.setCellSpacing(5);
    flexTable.setCellPadding(3);

    // Add some text
    cellFormatter.setHorizontalAlignment(
        0, 1, HasHorizontalAlignment.ALIGN_LEFT);
    flexTable.setHTML(0, 0, constants.cwFlexTableDetails());
    cellFormatter.setColSpan(0, 0, 2);

    // Add a button that will add more rows to the table
    Button addRowButton = new Button(
        constants.cwFlexTableAddRow(), new ClickHandler() {
          public void onClick(ClickEvent event) {
            addRow(flexTable);
          }
        });
    addRowButton.addStyleName("sc-FixedWidthButton");

    Button removeRowButton = new Button(
        constants.cwFlexTableRemoveRow(), new ClickHandler() {
          public void onClick(ClickEvent event) {
            removeRow(flexTable);
          }
        });
    removeRowButton.addStyleName("sc-FixedWidthButton");
    VerticalPanel buttonPanel = new VerticalPanel();
    buttonPanel.setStyleName("cw-FlexTable-buttonPanel");
    buttonPanel.add(addRowButton);
    buttonPanel.add(removeRowButton);
    flexTable.setWidget(0, 1, buttonPanel);
    cellFormatter.setVerticalAlignment(0, 1, HasVerticalAlignment.ALIGN_TOP);

    // Add two rows to start
    addRow(flexTable);
    addRow(flexTable);

    // Return the panel
    flexTable.ensureDebugId("cwFlexTable");
    return flexTable;
  }

  /**
   * Add a row to the flex table.
   */
  private void addRow(FlexTable flexTable) {
    int numRows = flexTable.getRowCount();
    flexTable.setWidget(numRows, 0, new Image(Showcase.images.gwtLogo()));
    flexTable.setWidget(numRows, 1, new Image(Showcase.images.gwtLogo()));
    flexTable.getFlexCellFormatter().setRowSpan(0, 1, numRows + 1);
  }

  /**
   * Remove a row from the flex table.
   */
  private void removeRow(FlexTable flexTable) {
    int numRows = flexTable.getRowCount();
    if (numRows &gt; 1) {
      flexTable.removeRow(numRows - 1);
      flexTable.getFlexCellFormatter().setRowSpan(0, 1, numRows - 1);
    }
  }

</pre>